Question

Robert sketches two rectangular prisms, A and B. Prism A's side lengths are 5 centimeters, 6 centimeters and 7 centimeters. Prism B's side lengths were twice those of prism A's: 10 centimeters,12 centimeters, and 14 centimeters. Robert says that surface area of prism B is twice the surface area of prism A. Is he correct? If he is not, how many times as great as prism A's surface area is prism B's surface area? Show your work.

Answer 1

fasle
LH=legnth times height
HW=height times width
LW=legnth times width
surface area=2(LH+LW+WH)

A surface area is 2(5*6+5*7+6*7)=214

b surface area is double everybody si
2(10*12+10*14+12*14)=856

214 times 2=428


he is wrong

how many times as great?
856/214=4

answer is 4 times

net is second drawing